https://github.com/noties/nullsafe

Null safe flow for Java & Android
https://github.com/noties/nullsafe

android java null

Last synced: 2 months ago
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Null safe flow for Java & Android

• Host: GitHub
• URL: https://github.com/noties/nullsafe
• Owner: noties
• License: apache-2.0
• Created: 2017-10-26T13:04:45.000Z (about 7 years ago)
• Default Branch: master
• Last Pushed: 2017-10-27T09:21:00.000Z (about 7 years ago)
• Last Synced: 2023-07-07T14:17:22.922Z (over 1 year ago)
• Topics: android, java, null
• Language: Java
• Size: 58.6 KB
• Stars: 1
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# NullSafe

[![Maven Central](https://img.shields.io/maven-central/v/ru.noties/nullsafe.svg)](http://search.maven.org/#search|ga|1|g%3A%22ru.noties%22%20AND%20a%3A%22nullsafe%22)

Null safe flow for Java.

Java8:

```java

// `country` can be null, meaning that no mapping will occur and "Unknown" will be returned

final String name = NullSafe.create(country)

        .map(Country::city) // map function will never call Supplier with null argument

        .map(City::street)

        .map(Street::name)

        .get("Unknown");

```

```java

final City capitalCity = capitalCity();

final String name = NullSafe.create(country)

        .map(capitalCity, Country::city) // allows to specify def values (cannot be null)

        .map(City::street)

        .map(Street::name)

        .get("Unknown");

```

```java

// NullSafe instance can be used to split the flow (safe to reference intermediate state)

final NullSafe nullSafe = NullSafe.create(country)

        .map(capitalCity, Country::city);

final String name = nullSafe

        .map(City::street)

        .map(Street::name)

        .get(); // <- returns nullable if no def value was specified

final House house = nullSafe

        .map(City::street)

        .map(Street::house)

        .get();

```

This utility class is **not** thread-safe